Piston-rod packing



(No Model.)

Gr. J. ROBERTS 817 H. FARNUM. PISTON ROD PACKING.

' Patented Dec. 3, 1889.

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UNITED STATES vPATENT OFFICE.

GEORGE .LROBERTS AND HENRY FARNUM, OF DAYTON, OHIO.

PISTON-ROD PACKING.

SPECIFICATION forming part of Letters Patent No. 416,501, dated December 3, 1889.

Application filed April 24, 1889. Serial No, 308,351. (No model.)

To @ZZ whom, t may concern:

Be it' known that we, GEORGE J. ROBERTS and HENRY FARNUM, of Dayton, in the county of Montgomery, and in the State of Ohio, have invented certain new and useful Improvements in Piston-Rod Packing; and we do hereby declare that the following is a full,

clear, and exact description thereof, reference being ad to the accompanying drawings, in which- Figure 1 is a vertical central section of a stuflng-box provided with our piston-rod packing; Fig. 2, a top plan view of the packing; Fig. 3, a similar View of the lower half of the packing, and Fig. 4 a detail Sectional view on line c a: of Fig. 2.

Letters of like nameand kind refer to like parts in each of the figures.

The object of our invention is t-o provide an improved metallic packing for stuffing-boxes adapted for use in pumps, steam-engines, motors, and other machines where a piston or other moving rod is to be packed; and to this end our invention consists in the packing and the construction, arrangement, and combinawit-li the stuffing-box, as hereinafter specified.

In the drawings, A designates the base or lower portion of the' stuffing-box, through which passes the piston-rod B. The top A of the box is shownas fastened to base A by means of the screws or bolts a a.

. The shape of the stuffing-box and the means for fastening the two parts together can be varied, as desired, without involving any departure from our invention.

Within the lower part or base of the boxl is a central recess C, concentric with and larger than the piston-rod. Such recess does not extend down through the stuffing-box base, and has at its lower end an abrupt face or'shoulder c, for a purpose to be described hereinafter. In the box top or cap A is a similar, but larger, recess C', extending from the lower face of the cap upward to a point some distance below the upper side of the cap. Surrounding the 'piston-rod B and engaging the top of the recess C is the ring D, having its upper side el made dat, so as to rest squarely against the'recess top and on its under side the conical face d, extending from a point near the outer edge or periphery of the ring upward and inward to the inner edge of the `D and D.

same. In the lower portion of recess C is another ring D', having on its upper side the conical downwardly and inwardly extending surface cl2, and on its lower side the annular downwardly-proj ecting portion cl3. Surrounding the piston-rod B in the space between the oppositely-arranged conical faces of rings D and D are the rings E E', having the plain abutting faces c c', respectively, in planes at right angles to the axes of the rings, and their inner faces curved to fit the piston-rod closely. The upper side of the ring E is made with a conical face e2, to be engaged by the conical face CZ on the upper ring D, while the lower side of ring E is similarly shaped or provided with a conical face e3, to be engaged by the conical surface or face d2 on the lower ring D. Each ring E E is divided up into several parts or segments, preferably three in number, as shown in the drawings. Surrounding these divided rings, respectively, are the rings F F', each cut through at one point, so as to allow of its being contracted in diameter to compensate for the wear of its 1 respective divided ring upon the piston-rod. tion of the parts thereof with each other and The inner faces of the rings F F are made parallel with the peripheries of the respect- :ive rings E E', inclosed by them, while the vupper side of ring F and the lower side of y ring F are made conical, to be engaged, re-

spectively, by the conical surfaces on rings A spring G, situated in the lower recess 0,' rests at its lower end upon the recess bottom and with its upper end engages the lower ring D', so as to press the same upward. The annular projection di on this ring serves to OO a keep the upper end of the spring in place and away from or out of contact with the rod B.

To prevent the rings E E" and F F from getting turned or arranged so that the divisions in any of the different rings shall register or come together, so as to afford a chance for leakage, we employ a dowel-pin H, which engages and passes through registeringnotches in the rings of both pairs EF and E F.

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The operation of our packing, arranged and constructed as shown and described, is, briefly, as follows: As the spring G forces the lower ring D up toward the upper ring D, the concave conical faces on the two rings, engaging the conical faces on the upper and lower sides of the rings E F and E F', respectively, tend to force such rings together and also inward, so as to cause the parts of the two inner rings E E to fit the piston-rod B closely.

It will be observed that the rings F F are not merely spring-rings acting by their own elasticity to clamp and hold the parts of rings E E together, but that the inclines or conical faces on the rings D D engage not only the conical faces on rings E E to force the parts of such rings inward upon the shaft, but also the inclines on the outer rings F F', so as to contract such rings closely upon the rings E E. As the parts of rings E E wear upon the piston-rod, the rings F F will be correspondingly contracted by the action of the conical faces of the rings D D as the latter ring is forced toward the other by spring G'. In this way all wear is automati cally taken up or compensated for in our packing, and the rod willalways be packed with the proper degree of closeness.

rl-he dowel-pin` II, as indicated hereinbefore, keeps the various adjoining or abuttingrings from getting turned, so as to cause a division or cut in one to register with that in another.

Ve prefer to make the rings D D of brass and [the rings E F E F of Babbitt metal; but do not limit ourselves to such :materials as other metals can be used.

Having thus described our invention, what we claim is l. In a piston-rod packing, in combination with the two abutting rings divided into several parts and adapted to it around the pistonrod and having their outer sides coni cal, the two divided rings around the formerrings and having similar conical surfaces, and the two rings with conical faces to engage the opposite conical faces on the outer and inner rings,v substantially as and for the purpose shown.

2. In a piston-rod packing, in combination with the two divided inner pistonrod-engag ing rings, a dowel-pin engaging longitudinal notches in the peripheries of the two rings differently situated with reference to the lines of division of the respective rings so as to keep the joints between the ring parts from registering with each other, and means for inclosing and holding the rings adapted to engage and retain the dowel-pin in the ringnotches, substantially as and for the purpose shown.

3. In a piston-rod packing, in combination with the two rod-engaging rings divided into several parts and having their abutting sides fiat and the opposite outer sides provided with conical surfaces, the divided rings, each inclosing one of the rod-engaging rings and having conical surfaces correspondin g with those on theinclosed rings, and the two rings on opposite sides of the rod-engaging rings having conical concave faces to engage, respectively, the conical faces on the opposite sides of the shaft-engaging rings and the rings inclosing the latter, substantially as and for the purpose shown.

4f. In a piston-rod packing, in combination with the stuliing-box having a recess around its piston-rod opening, the upper ring resting. against the recess end and having its lower side provided with a conical face extending upward and inward, the lower ring having on its upper face a corresponding conical face extendinginward and downward, the pair of inner abutting rings divided into several parts and having-their outer sides made coni cal to fit the conical faces, respectively, in-the upper and lower rings,and the two divided rings each inclosing one of the inner divided rings and, like them, having conica-l faces to t the faces of the upper and lower rings, and a spring engaging the lower ring, substantially as and for the purpose set forth..

5. In a piston-rod packing, in combination with the two divided inner piston-rod-engaging rings, a dowel-pin engaging longitudinal notches in the periphery of the two ringsdifferently situated with reference to the lines of division of the respective rings, so asv to keep' the joints between the ring parts from registering with each other, and mea/ns for l? inclosin g said rin-gs and holding them against a piston-rod, substantially as and for the purpose described. V

6. In a piston-rodpacking, in combination with the two inner divided rings having notches in their peripheries differently situated wit-h reference to the lines of division of the respective rings, the two divided rings each i-nclosing one ofthe inner rings, having l on their inner sides notches differently situated with reference to thelines of division of the respective rings, and a pi-n or key engag- 1 ing the notches in all the rings, substantially l as and for the purpose shown.

7. In a piston-rod packing, in combination with the two inner rings divided up into` several parts, and the two rings split or divided y at one point, each inclosing one of the inner rings, a pin or key engaging notches in the inner faces of the inclosing-rings and in the peripheriesof the inner rings, the notches in the different rings being differently situated with reference to the lines of division of the respective rings, substantially as and for the purpose set forth.

In testimony that we claim the foregoing we have hereuntoset our hands this 11th day of March, A. D. 1889.

GEORGE J. ROBERTS. HENRY FA'RNUM. I'Vitnesses:

MICHAEL J. SWADENERL, EDWARD T. I-IALL.

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